<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>Sample</title>
<meta name="viewport"
            content="width=device-width, initial-scale=1.0">
<meta name="HandheldFriendly" content="true">
</head>
<body>
<canvas id="myCanvas" width="300" height="150"
        style="border:1px dashed #c3c3c3;">
   这里放置的内容用于浏览器不支持Canvas的情况
</canvas>
<script>
var canvas = document.getElementById("myCanvas");
if (canvas && canvas.getContext) {
   var cxt = canvas.getContext("2d");
   // 创建image
   var img = new Image();
   img.src = "images/logo_yahoo.png";
   // 当图片加载完毕再绘制
   img.onload = function (event){
	  // 三种重载方法
	  cxt.drawImage(img, 0, 0);
	  cxt.drawImage(img, 0, 50, 101, 25);
	  cxt.drawImage(img, 100, 0, 101, 50, 150, 50, 101, 25);
   }
}
</script>
</body>
</html>
